[Gllug] Are old Unix books any good?

[Dermot Moynihan]

Sometime ago, in response to a request here on what books to get to 
facilitate my learning Linux, I was advised not to close my eyes to the 
possibilities of Unix books. As I know nothing about Unix or its evolution 
can anybody recommend a sort of a cut off publishing date before which the 
book would not be worth getting. Or should I regard the date as being 
irrelevant? I don't have enough knowledge to judge the content.

rgds
dermot